Levonorgestrel enteric-coated tablets have not shown contraceptive success. Levonorgestrel enteric-coated tablets, the main ingredient of which is levonorgestrel, are a kind of emergency contraceptive, mainly used when unprotected or other contraceptive methods fail by chance. After use, some women may experience abnormal uterine bleeding, also called withdrawal bleeding, which is related to hormone levels, but this is not a sign of successful contraception, and there is no sign of successful contraception after using the drug. Levonorgestrel enteric-coated tablets may occur adverse reactions, mainly menstrual manifestations, such as early or delayed, but also nausea, vomiting, breast tenderness, dizziness, fatigue and other discomforts, if suspected of pregnancy or already pregnant can not be used, if there is breast cancer, cancer of the reproductive organs, liver function abnormalities, women over the age of 40 years old is prohibited. If you need to use the drug, it is recommended to use the drug under the guidance of a doctor, not blindly self-medication to avoid adverse effects.